Printing-press.



No. 629,968. Patented Aug. I, I899.

Patented'Aug. I, I899.

No. 629,968. v 0. ROESEN.

f-BINTING PRESS.

(Application filed Apr. 27, 1898.

2 Sheets-Sheet 2.

. {No Model.)

Tm: nonms vzTzns co PHDTCI-LITHO. WASHKNGTON, u. c."

I UNITED STATES ATENT rrrcn.

OSCAR ROESEN, OF NEW YORK, N. Y., ASSIGNOR TO ROBERT HOE, THEO- DORE H. MEAD, AND CHARLES CARPENTER, OF SAME PLACE.

PRlNT|NG PRESS.-.

FSPECIFICATION forming part Of LettersPa'tent NO. 629,968, dated August 1,1899. I Application filed April 2'7, 1898. Serial No. 678,947. (No model] To all whom, it may concern.-

Beitknown that I, OSCAR Ronsnn, a citizen of the United States, residing at New York, county of New York, and State of New York, have invented certain new and useful Improvements in Printing Presses, fully described and representedin the followingspecification and the accompanying drawings, forming a part of the same.

This invention relates to printing-presses, 4 and has for its especial object to provide means in perfecting presses for holding the sheet to the impression-cylinder without the liability of soiling the same by offset ink. It is usual for the sheet to be held to the impression-cylinder by grippers, which press the sheet upon the tympan. After the tympan becomes slightly soiled this pressure of the sheet under the grippers is likely to produce an offset upon the sheet. In work where there is no trimming this oii'z'set is a serious injury to the product, and where paper wide enough to trim j is used considerable expense is entailed In order to overcome this diiiiculty, I have devised my present invention, which consists in providing a gripper bearing-piece so placed that the grippers may close upon it in grasping the sheet, and thereby hold the sheet in proper position to receive the impression and at the same time so that it shall not interfere with the free shifting movement of the tympan to present fresh tympan-surfaces. To this end one form of my invention consists in mounting the bearing-piece movably, so that when the grippers are resting upon it it shall rest against the edge of the cylinder-shell which supports the tympan or against the tympan itself, and when the grippers are in their re tracted position and the tympan is to be. shifted the bearingpiece shall be moved back from the tympan, so as not to interfere with the movement of the latter.

In the drawings annexed, Figure 1 is a vertical sectional elevation of the part of an impression-cylinderembodying myinvention,in which the bearing-piece and grippers are in the position in which the sheet is held by them upon the cylinder. Fig. 2 is a similar view showing the position of the parts in which 50 the grippers are open and the bearing-piece l is withdrawn from the tympan.

Fig. 3 is aview of the same mechanism from above, the point of view being shown by the arrow 3 in Fig. 1. Fig. 4 is a similarview on a reduced scale. 5 5

A is the shell of an im pressiou-cylinder u pon which is the blanket B, held by the blanketgrippers B. The sheet-grippers are shown at O, mounted upon the gripper-rod D. The bearing-piece for the sheet-grippers is shown at E mounted upon arms F, pivoted upon the shaft D,and connected with a swingingspringrod G. Fast upon the gripper-shaft are a series of lugs H, and connected with the arms F are a series of lugs I, so placed that the lugs H meet the lugs I when the grippers are almost fully opened and cause the arms F to swing against the pressu re of the spring-rod G until the bearing-piece E takes the position shown in Fig. 2. In this position the tympan is free and may be shifted as desired.

When it is wished to withdraw the bearingpiece E farther from the edge of the cylindershell in order to afford more room for access to the interior of the cylinder, the bearingpiece maybe thrown back to the position shown in broken lines in Fig. 2, in which case the spring-rod G swings to the position shown in broken lines and holds the bearing-piece in its position of farthest withdrawal until sufficient force is applied to the bearing-piece to shift it back to the position shownin Fig. 2.

The tympan passes over the tension-rolsl K K to a tympan-carryin g roll. (Not shown.)

Any of the well-known tympan-shifting devices may be employed for shifting the tympan-such, for instance, as that shown in the patent to Orowell, No. 596,025, dated December 21, 1897.

What I- claim is- 1. The combination of an impression-cylim der, tympan-shifting mechanism, sheet-grippers, and a movable bearing-piecetherefor normally resting against the tympan, said bearing-piece being so mounted as to with draw at the proper time so that it shall not interfere with the movement of the tympan, substantially as set forth.

2. The combination with an impression-cylinder, of a tympan-shifting mechanism, aset I00 of grippers, a bearing-piece therefor norm ally resting against the tym pan, a rod upon which the bearing-piece is mounted, and means for giving the bearing-piece an axial movement with respect to the rod in order to permit the operation of the tym pan-shifting mechanism, substantially as described.

3. The combination with an impression-cylinder, of a tympan-shifting mechanism, aset of grippers, a movable bearing-piece therefor, and means brought into operation by the movement of the grippers, whereby the movement of the bearing-piece is effected, substantially as described.

4. The combination wi th an impression-cylinder, of a set of grippers, a rod upon which the grippers are mounted, and abearing-piece for the grippers loosely mounted on said rod, substantially as described.

5. Thecombination withanimpression-cylinder, of a set of grippers, agripper-carrying rod, a bearing-piece for the grippers loosely mounted on said rod, and means operating to hold the bearing-piece in one position of the parts against the edge of the gripper-opening and in another position away from the edge of said opening, substantially as described.

6. The combination with an impression-cyl inder, of a set of grippers, a movable bearingpiece for the grippers, and means operating to hold said bearing-piece in one position against the edge of the gripper-opening and in another position away from said edge, substantially as described.

7. The combination with an impression-cylinder, of a set of grippers, a movable bearingpiece therefor, and means brought into operation by the movement of the grippers,whereby the'movement of the bearing-piece is effected, substantially as described.

8. The combination with an impression-cylinder, of a tympan-shifting mechanism, aset of grippers, a gripper-carryin g rod, a movable bearing-piece for the grippers loosely mounted on the rod, means for holding the bearingpiece normally against the edge of the gripper-opening, and means carried by the gripper-carrying rod for moving the bearing-piece when the grippers are opened, substantially as described.

9. The combination with an impression-cylinder, of a t-ympan-shifting mechanism, a set of grippers, a gripper-carrying rod, a bearingpiece for the grippers loosely mounted on the rod, a spring operating to hold the bearingpiece against the edge of the gripper-opening in one position of the parts and away from said edge in another position ofthe parts, and means carried by the gripper-carrying rod for moving the bearing-piece against the stress of the spring when the grippers are opened, substantially as described.

10. The combination of bearing-piece E mounted on arms pivoted to the gripper-rod with lugs 11 and I, substantially as set forth.

11. The combination of bearing-piece E, arms F, spring-rod G, lugs 11 and I, substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing 

